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首页> 外文期刊>Physical review >Inelastic neutron scattering study of the hydrogenated (Zr_(55)Cu_(30)Ni_5Al_(10))_(99)Y_1 bulk metallic glass
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Inelastic neutron scattering study of the hydrogenated (Zr_(55)Cu_(30)Ni_5Al_(10))_(99)Y_1 bulk metallic glass

机译:氢化(Zr_(55)Cu_(30)Ni_5Al_(10))_(99)Y_1大块金属玻璃的非弹性中子散射研究

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摘要

The lattice dynamics of both as-charged and room-temperature-aged, hydrogenated bulk metallic glasses (BMGs) with the stoichiometry of (Zr(55)Cu_(30)Ni_5Al_(10)_99Y_1 have been investigated by inelastic neutron scattering at 4 K. The vibrational density of states of dissolved hydrogen atoms in the as-charged BMG shows a broad band maximized at ~ 135 meV. Three months of room-temperature aging caused this band to narrow somewhat, losing intensity at both lower and higher energies. The results suggest that hydrogen atoms preferably occupy the interstitial tetrahedral-like t sites comprised of four Zr atoms, with a local atomic arrangement similar to that of δ-zirconium hydride. At higher hydrogen loadings, hydrogen atoms can also occupy octahedral-like and/or more Zr-deficient tetrahedral-like o sites. The spectral differences between the as-charged and aged specimens and accompanying Vickers hardness measurements suggested that around two-thirds of the hydrogen atoms in the as-charged specimen were trapped in the strongly binding t sites and relatively immobile at room temperature, while the remaining one-third occupied the more weakly binding o-sites and disappeared from the specimen upon aging. These latter sites most likely play a crucial role in the diffusion of hydrogen in BMGs at room temperature.
机译:通过在4 K下进行非弹性中子散射研究了化学计量为(Zr(55)Cu_(30)Ni_5Al_(10)_99Y_1)的带电和室温时效的氢化块状金属玻璃(BMG)的晶格动力学。 。处于带电状态的BMG中溶解氢原子态的振动密度显示出一个宽频带,在135 meV处最大,室温老化三个月使该频带略微变窄,在较低和较高能量下均失去强度。结果表明,氢原子优选占据由四个Zr原子组成的间隙四面体状t位,其局部原子排列与δ-氢化锆相似;在较高的氢负载量下,氢原子也可以占据八面体状和/或带电的和老化的试样之间的光谱差异以及伴随的维氏硬度测量结果表明,带电的s中约有三分之二的氢原子样品被困在具有强结合力的t位点上,并且在室温下相对不动,而其余的三分之一占据了结合力较弱的o位点,并在老化后从样品中消失。后者在室温下很可能在氢在BMG中的扩散中起关键作用。

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  • 来源
    《Physical review》 |2011年第17期|p.174206.1-174206.6|共6页
  • 作者单位

    Department of Engineering and System Science, National Tsing-Hua University, Hsin-Chu, Taiwan 300,Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA;

    NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, MS6102,Gaithersburg, Maryland 20899-6102, USA,Department of Chemical Engineering, University of Delaware, Newark, Delaware 19716, USA;

    NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, MS6102,Gaithersburg, Maryland 20899-6102, USA;

    Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Department of Engineering and System Science, National Tsing-Hua University, Hsin-Chu, Taiwan 300;

    Department of Engineering and System Science, National Tsing-Hua University, Hsin-Chu, Taiwan 300;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    metals, semimetals, and alloys;

    机译:金属;半金属和合金;

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